If mac_selinux_access_check() or bus_verify_bypass_dump_ratelimit_async() fail, we goto "ratelimited" where we set a custom D-BUS error. In "ratelimited", we call sd_bus_error_setf() which eventually hits an assert_return(!bus_error_is_dirty()). Avoid hitting this assertion by passing NULL as the error to mac_selinux_access_check() and bus_verify_bypass_dump_ratelimit_async() since we will override the error immediately anyway if either fails. We modify both functions as well to allow passing a NULL error and fix the argument name as well while we're at it.
System and Service Manager
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